Marco and Sean became friends through their mutual friend Craig Manning in Season 2 of Degrassi: The Next Generation. However, by the beginning of the third season, the two had completely drifted apart. Sean had found a new best friend in troublemaker Jay Hogart, and Marco came out as gay. Though they were briefly reunited when Sean began dating Ellie Nash, Marco's best friend and former girlfriend, it was clear that they no longer had anything in common.

Friendship History

Season 2

In Drive, Craig Manning invites Sean, Marco, and Spinner Mason to his house. They decide to prank call people and Marco dials a number and gives Sean the phone. The person on the phone is revealed to be Sean's ex-girlfriend Emma Nelson. Sean is shocked and chases Marco around the room.

In Careless Whisper, Sean makes fun of Marco for supposedly checking him out.

Season 3

In Don't Dream It's Over, Ellie and Marco go to the movies where Jay looks at him weird; then he and Alex go buy popcorn. Sean is disappointed that Marco is there but just wants to get seats. Sean is at the movies and looks at Marco who is laughing at the movie. Sean goes to eat popcorn but Marco's hand is there and quickly pulls it away. At school, Sean sees Ellie sitting with Marco and tries to get Marco out of there so he and Ellie can talk; she gets mad and leaves. Later, Ellie tells Marco she's dumping Sean, but he says Sean can be great for her. She then finds Sean and tells him she's sorry, and they kiss.

Season 4

In Anywhere I Lay My Head, Marco attends Sean's house party.

In Back In Black, Marco and Sean were seen at the school's respect and reflection day after the school shooting.